Circularly-moving-hook sewing machine



G. WOELFEL AND W. HOFF- CIRGULA'RLY MOVING HOOK SEWING MACHINE.

APPLICATION FILED MAR. 2,1921- 1,438,76. I Patented Dec. 5-, 1922.

IIIIIIIIIWIIIII/IlfYI/I/I JVETN ESSES:

MNUWSKWWWMD ATTORNEY 25 by the needle-clamp 26 is the needle 27 whichcooperates in a well known manner with the circularly moving hook orlooptaker 6 inthe formation or stitches. its so far described theconstruction and operation does, not differ substantially from thatdisclosed in the Diehl and Grieb patent re f-erred to, the loop ofneedle-thread being passed about the threadcase in substantially thesame manner as in that of the patented construction. v

' According to the present improvement the bobbin case holder isprovided with a latch or spring-member 28 the flattened end of which isapertured to receive the reduced head 15 of the pin 15 while its otherend is reduced in width and formed with depending sides 28..Intermediate its ends the spring member 28 is fixedly secured to theholder by the screw 29, the aperture 29 through which the screw passesbeing slightly larger than the shank of the screw to permit a slightlateral adjustment of the holder 14 relative to the spring-member aboutthe pivot 15'. The free end of the spring-member 28extends over theflange 12 of the loop-taker 6' and enters a notch 30 formed injthework-support 1 adjacent the cover-plate spring 31. Theholder 14- retainsthe thread-case 10 in position upon and restrains it from movement withthe oscillating looptaker 6, but the threachcase is not in contact withthe holder except. at or nearits oppositeends or horns against one orthe other of which the thread-case will rest lightly. The point ofcontact between the loop-discharging or heel portion 10 of thethread-case l0 and the holder 14: is afforded by a buffer spring 32secured to the holder by a screw 83 the free end of the buffer springbeing spaced from and embracing the end of the holder. The yield ingcontact between the buffer-spring 82 and the thread-case serves tolessen or deaden any noise which might be occasioned during the passageof the thread-loops be- "tween these parts.

During the normal operation of the machine, the thread-case 10 andholder 14 occupy-the position shown in Fig. 2; that is, the free end ofspring-member 28 is seated within and maintained in the notch 30 of thework-support and thereby retains the thread-case 10 supported upon theflange 12 of the lo0p-taker 6. If for any cause, IltlS desired to removethe thread-case from the loop-takenwhich might be necessary when theflange and groove connection between the two become clogged or jammedbyobstructions, or when access is desired to the cavity in the sewingmachine work-support in which the lower thread-handling clevicesarelocated, the free end of the spring-member 28 may be raised byascrew-driver or finger nail clear of its notch 30 in the Work-supportand shifted to the right, as illustrated in Fig. 3. This will providesufiicient clear ance between the holder 14 and the threadcase 10 topermit the latter to be displaced transversely of the axis of movementof the loop-taker or in a direction parallel with its plane of movementso that the flange 12 of the loop-taker 6 will clear the peripheralgroove 11 of the thread-case 10 and permit the latter'to be removed fromthe field of action of the loop-taker. After the threadcase has beenremoved from its operative position within the loop-taker, the groove 11of the thread-case and the flange 12 of the loop-taker may be readilycleared of any obstruction such as lint or thread ends which may haveprevented the free movement of the loop-taker about the tl1readcase.Removal of the thread-case will also give free access to the cavity 2 inthe work-support to facilitate the removal of any foreign matter whichmay have found lodgment upon the bracket 3. v v

To restore the thread-case 10 in operative relation with the loop-taker,it is lowered into position until its groove 11 is opposite the flange'12 of the loop-taker. when by a slight lateral movement, the flange ofthe loop-taker will again be engaged by the groove in the thread-casewhereupon the holder-14 is shifted to the left until the 1 free end ofthe spring member or latch 28 drops into the notch 30 of thework-support. The parts are thenagain in the posit-ion shown in Fig.2 inthe proper, relation for a sewing operation;

In assembling. the lower thread handling mechanism in the sewing machinework-support, the clearance between the buffer spring 32 and the loopdischarging or heel portion 1.0 of the thread-case 10 must be regulatedto a nicety to maintain quietness in operation while afl'ording a freepassage for the lower limb of the needle-thread loop as it is cast aboutthe thread-case, and drawn up by the take-up. In the machine of thepresent improvement this is readily accom plished by loosening thefastening screw 29 entering the holder 14, the aperture 29- in thespring-men'1ber'28 being larger than the shank of the screw, andshifting the holder the requisite amount relative to the spring-member28 until the desired amount taker, and a latch carried by said holder topermit its displacement relative to said thread-case. v v

2. In a sewing machine, in combination, a work-support, a circularlymovable looptaker housed within a cavity in the worksupport, athread-case having at one side a bearing in and supported by saidlooptaker, aholder positioned within the field of action of saidloop-taker and having a portion adapted for engagement with the otherside of said thread-case to confine it to said bearing and restrain itfrom movement with the loop-taker, and a springmember secured to saidholder and in operative engagement with said'worlesupport to permitdisplacement of said holder relative to said thread-case favorable forthe removal of said thread-case from said looptaker.

3. In a sewing machine, in combination, a work-support, a circularlymovable looptaker housed within a cavity in the worksupport, athread-case having at one side a bearing in and supported by said loop-.

taker, a holder positioned withinthe field of action of said loop-takerand having a portion adapted for engagement with the other side of saidthread-case to confine it to said bearing and restrain it from movementwith the loop-taker, and a springmember secured to said holder with itsfree end entering a notch in the work-support within the field of actionof said loop-taker for retaining the thread-case in cooperative:

relation with the'loop-taker, a stationary stop for retaining the holderin operative position, and means whereby said holder; maybe shiftedrelative tosaid stationary stop to a positionfipermitting removal. of

the thread-case fromthe loop-taker.

5. In a sewing machine, in combination, a work-support, a circularlymovable looptaker sustained by said work-support, a thread-caseperipherally supported by said loop-taker, a holder positioned withinthe.

field of actionof said loop-taker for retaining said thread-case incooperative relation therewith, primary means for positioning the holderon the, work-support,

and means auxiliary thereto for adjusting the clearance between thethread case and holder. o a i a V 6.- In a sewing machine, incombination,

a work-support, acircularly movableloop- I taker sustained by saidworlcsupport, a thread-case peripherally supported by said loop-taker, aholder positioned within the field of action of said loop-taker for retaining said thread-case in cooperative'relation therewith, primarymeans for positioning the holder uponthe work-support, a buffer springcarried by said holder and in engagement with said thread-case, andmeans auxilliary thereto for adjusing the clearance between thethread-case and buffer-spring. a

7 In a sewing machlne, 1n combination,

a circularly movable loop-taker, a thread- L case peripherally supportedby said -looptaker, a holder positioned within the field of action ofsaid loop-taker comprising relatively movable members one of which isadapted to retain the thread-case i'n' cooperative relation with theloop-taker and the other of which engages a stationary i part of themachine, and means whereby said parts may be adjusted relative to one,

anotherto vary the clearance between the thread-case and'holder;

In testimony whereof, wehave signed our names to this specification. I a

' GEORGE WOELFEL.

WILLIAM HOPF.

